多孔PMMA/TiO_2纳米复合材料的制备及其压缩力学性能

PREPARATION AND THE COMPRESSIVE MECHANICS PROPERTIES OF THE POROUS PMMA/TiO_2 NANOCOMPOSITES

通过甲基丙烯酸甲酯本体聚合发泡的新方法,制备了多孔聚甲基丙烯酸甲酯(PMMA)/TiO2纳米复合材料,对所得复合材料的压缩力学性能进行研究。结果表明,复合材料的压缩应力-应变曲线具有多孔泡沫材料明显的线弹性段、塑性屈服平台段及致密段特征;随着纳米TiO2含量的增加,复合材料的压缩弹性模量和压缩强度也随之增大;而对于相同纳米TiO2含量的复合材料来说,随着变形速率的增大,材料的压缩强度随之增大。

The porous PMMA/TiO2 nanocomposites were prepared by methyl methacrylate bulk polymerization foaming method.Their compressive mechanics properties were studied.The results indicated that the compressive stress-strain curves of the nanocomposites had obvious three phases characters of the porous foams,i.e.,linear elastic phase,plastic yield flat phase and compact phase.With increasing of the nanograins content,the compressive elastic modulus and compressive strength of the nanocomposites increased.At the same nanograins content,their compressive strength increased with the increasing of the deformation rate.